Spark-plug.



A. R. MOSLER.

SPARK PLUG.

APPLICATION FILED Nov. 14, 1912.

1,218,298. Patented Mar. 6, 1917.

MYI IEEBEBF ELIE/7707*:-

W w ays-t;

.i irTFill @FFTQE.

tl'NlTEl) ARTHUR It. MOSLEB, OF NEVJ YQRK, N. "521, ASSIGNOR TO A. R.:MGSLER & 00., OF YONKERS, NEW YORK, A CORPORATION OF NEW YORK.

Application filed November 14, 1912.

To all whom it may concern:

Be it known that I, Anrnur. lilosnnn, a citizen of the United. States,and resident of the borough of lvlanhattan, in the city and State of NewYork, have invented a new and useful Improvement in Spark-Plugs, ofwhich the following is a specification.

This invention relates to spark plugs, and more particularly to theassembly of the insulating block, central electrode and binding post.The objects are to produce an arrange ment of this character which isextremely cheap and yet entirely satisfactory in operation.

Another object is to provide an arrange ment whereby the electrode issecured in the insulating block in such a manner as to prevent thepossibility of gas leakage about the electrode and through the block.

Other objects are to provide certain improvements in the construction,form and arrangement of the several parts whereby the above mentionedobjects may be effectively carried out.

A practical embodiment of the invention is represented in theaccompanying drawings, in which,

Figure 1 represents a side elevation of the parts in their assembledposition.

Fig. 2 represents a vertical central section of the same.

Fig. 3 represents an end view of the same.

Fig. 4 represents a section taken in the plane of the line AA of Fig. 1,looking in the direction of the arrows.

Fig. 5 represents a section taken in the plane of the line BB of Fig. 1,looking in the direction of the arrows.

Fig. 6 represents a section taken in the plane of the line CC of Fig. 1,looking in the direction of the arrows.

Fig. 7 represents a side elevation of the cap and binding post.

Fig. 8 represents a bottom plan view of the same.

Fig. 9 represents a side elevation of the electrode wlth the packingring loosely wound thereon.

Fig. 10 represents a side elevation of the insulating block, and

Fig. 11 represents a side elevation of a modified form of electrode withthe packing ring loosely wound thereon.

The insulating block is denoted by 1, and

Specification of Letters Patent.

SPARK-PLUG.

Patented Mar. 6, 1917.

Serial no. 731,321.

may be of any convenient or desired shape. It is prefen bly providedwith a longitudinal hole, one part of which of greater cross sectionthan the other part, as clearly shown in Fig. 2. The electrode, commonlycarried by the insulating block, has a portion 2 of relatively smallcross section, and a portion 3 of relatively large cross section. Thecross sectional size of the electrode is such that its smaller portionwill loosely lit in the smaller portion of the hole in the insulatingblock 1, while its larger portion will have a correspondingly loose litin the larger part of the said hole.

The electrode is secured in the insulating block by means of someadhesive material, such for instance as cement, d, and in order to causethe cement to firmly grip the electrode, the latter is screw-threaded orotherwise roughened, as indicated at 5.

A packing ring 6 may conveniently be located between the enlargedportion of the electrode and the base of the enlarged portion of thehole in the insulating block.

A cap 7 is arranged to fit the outer end of the insulating block 1, andcarries a suitable binding post 8, which may be conveniently secured inthe cap 7, by squaring the end oi the binding post 8, and fitting thissquared end into the corresponding opening in the cap 7, and up-settingor riveting the said end of the binding post. This cap 7 is providedwith. a longitudinal, inwardly extending tongue 9 arranged to snugly litin a corresponding groove 10 in the top of the insulating block 1, toprevent the cap from turning on the block; while the insu lating blockis provided, near its upper end, with a shoulder 11, about which thelower edge of the cap 7 may be crimped, as clearly shown at 12 in Fig.2, for the purpose of firmly securing the cap against longitudinalmovement on the block. The tongue 9 on the cap 7, by reason of its snugengagement with the groove 10 in the insulating block, will enable a capwhich would otherwise lit loosely on the block, to be held firmly inposition against wabbling.

For making electric connection between the electrode and the bindingpost 8, the

upper end of the insulating block 1 is covered with some adhesivematerial such for instance, as cement, which is impregnated withcomminuted metal, such as iron filings. It will be seen that when thecap 7 is firmly forced down on to the insulating block 1, thiscon'nninuted metal will form electric connection. between the enlargedend 3 of the electrode and the base of the binding post 8. The cementimpregnated with this com minuted metal, is clearly shown at 13 in Fig.e.

Referring to the modified form shown in Fig. 11, the electrode may bemade of uniform cross section, but be provided with an abutment 14.arranged to engage the bottom of the enlarged portion of the hole in theinsulating block 1, with the interposition of the previously referred topacking ring (3.

in assembling this portion of the spark plug, it is only necessary topour cement in the hole in the insulating block, loosely coil thepacking ring about the lower portion of the electrode, as clearly shownin Figs. 9 and 11, and then force the electrode into the insulatingblock. This action will cause the enlarged portion of the electrode orthe abutment l t to crowd some of the cement down into the smallerportion of the hole in the insulating block and thus insure that theentire space between the electrode and the block is filled with thecement. The top of the insulating block is covered with cement intowhich is forced a quantity of comminuted metal, after which the cap 7carrying the binding post 8, is forced down on to the insulating blockand crimped about the shoulder 12.

It will be seen that this construction en ables the insulating block andelectrode to be very cheaply manufactured, no care being required toproduce an accurate fitting, as the cement will fill in all the spacesbe they relatively large or relatively small. Furthermore, the cementacts as a very firm binding agent between the electrode and theinsulating block and also as a positive gas check.

Also the provision of the comminuted metal. in the cement at the end ofthe insulating block obviates the necessity of hav ing an exact fit forproviding suitable electric contact between the binding post and theelectrode.

It is obvious that various changes might be resorted to in theconstruction, form and arrangement of the several parts withoutdeparting from the spirit and scope of my invention; hence I do not wishto limit myself strictly to the structure herein set forth, but

What I claim is:

1. In a spark plug, a one piece insulating block provided with alongitudinal hole therethrough, a shoulder in the said hole, anelectrode provided with an abutment, the said electrode being surroundedby ce ment for holding it securely in the hole in the said block withits abutment substantially against the said shoulder, and a pacle iugring between the shoulder and the abutment.

in a spark plug, a one piece insulating i lt;(i(- provided with alongitudinal. hole tlna'ethroilgh, one portion of said hole being ofgreater cross section than the remainder, an electrode located in saidhole and having one portion of greater cross sec tion than theren'iainder, its larger part and smaller part being of appreciably lesscross section than the correspond ing parts of the hole, and a layer ofcement surrounding the electrode within the hole for securing theelectrode in the block.

3. in a spark plug, an insulating block, an electrode therein, a cap forthe block carrying binding post, and comminuted metal adhesirely securedbetween the cap and block for making electric connection between thebinding post and electrode.

4 in a spark plug, an insulating block, an electrode therein, a cap forthe block carrying a binding post, and con'nninuted metal cen'ieiitedbetween the cap and block for making electric connection between the bining post and electrode.

53. in a spark plug, an insulating block, an electrode cemented therein,a cap for the block carrying a binding post, and a layer of cementbetween the cap and the block, the said layer being iuu'n'egnated withcom minuted metal for making electric connec tion between the electrodeand binding post.

In testii'nony, that I claim the foregoing as my invention, I havesigned my name, in presence of two witnesses, this 30th day of October,1912.

ARTHUR Pt. MOSLER.

Witnesses F. GEORGE BARRY, C. S. SUNDGREN.

Copies of this patent may be obtained for five cents each. by addressingthe Commissioner of Patents, Washington, D. G.

